| Term | Definition |
|---|
| food chain | The sequence of who eats whom in an ecosystem. |
| primary food consumers | In a food chain, those organsisms that eat food producers. |
| food producers | Plants and plant-like organisms that make food by photosynthesis from sunlilght, water and carbon dioxide. |
| protist | The kingdom of single-celled animal-like and plant-like organisms whose cells contain a nucleus |
| moneran | The most primitive of the five kingdoms of living things, single celled bacteria without a nucleus. |
| cellular respiration | The process by which a cell makes molecules of ATP with high energy bonds. |
| photosynthesis | The process by which plants and plant-like algae manufacture sugar and starch to use as food. |
| decomposers | Bacterial and fungi that break down nonliving materials into nutrient chemicals. |
| organelle | A small organ within a cell that performs a specific function. |
| chlorophyll | A green chemical pigment essential for photosynthesis. |
| chloroplasts | A cell organelle where photosynthesis takes place. |
| cell colony | Groups of identical cells that act like a single organism. |
| spirogyra | A type of thread-like cell colony with spiral chloroplasts |
| volvox | A type of hollow ball-shaped cell colony with smaller cells within it. |
| diatoms | Plant-like protists that have a hard outer mineral coating. Very important food and oxygen producers. |
| euglena | A protist that acts sometimes like a plant and sometimes like an animal. |
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